Diaphragm pump



Feb.

L. G. LINDSAY DIAPHRAGM PUMP Filed Nov. 15, 1934 26 Ill InV'enier-r L nn &. Lindsan M! W fitter-megs a 2 4 O 3 a w a s q 6 3% A M n 3 F L 6 flu 8 F in 3 s z 4.. it w I Patented Feb. 26, 1935 UNITED STATES PATENT OFFICE The Lindsay Ganley St. Paul, Mirin., a corporation Company, Incorporated,

Application November 15, 1934, Serial No. 753,145

6 Claims.

My invention relates to diaphragm pumps. While intended more particularly forv pumping air, it is obvious that it may be used for pumping other kinds of fluids. 4 Among the objects of ,the invention are the provision of a pump which is compact with a minimum number of moving parts all oi which are easily accessible and which in operation is quiet.

I accomplish the objects of the invention by providing a motor housing with a hollow bracket support extending out integrally from one of the housing heads, a diaphragm carried by the brackphragm extending down and onnected to the motor shaft directly beneath the diaphragm whereby a simple connecting rod is utilized without the provision of any gears. Another feature consists in aha'mber with inlet and outlet valves D located directly above the diaphragm, the inlet valve consisting of a downwardly openingvalve which is weighted to p eyei'it sticking thereof, the result being thattliemotor will not become stalled even if there should be a leak of backward pres- .sure past the outlet valve into the chamber above the diaphragm. 1

The novel features which I believe to be characteristic of ,the" invention. are set forth with I particularity'in the appended claims. The inventionitsel'f, however, both as to its organization and m'ethodof operation, together with additional objects and advantages will be best understood from the following description of a specific embodiment when read in connection with the ac-- companying drawing in which,

Fig? 1 is a side elevational View of a motor housing head and bracket integral therewith. -Fig. 2 is an end elevational view of what is shown f in Fig. 1 and with a small portion in section; Fig. 3 is a view on a reduced scale showing the pump mostly in central vertical section.

In the embodiment of my invention shown in the drawing, I provide a motor housing 10 which has a suitable supporting base 12. At one end;

ings 32 in the flange 26. These screws also pass through holes disposed around the marginal portion of a flexible diaphragm 34 whereby this marginal portion is clamped between the flange 26 and the bottom of thecupmember 28 so that this bottom member and the diaphragm form a chamber. The central portion of the diaphragn is secured to the enlarged upper end 36 of a connecting rod 38 by screws 40 which pass through a plate 42 on the upper side of the diaphragm and are threaded into the member 36.

i The lower end of the connecting rod. 38 is atcrank pin 46 carried by the projecting end of the motor shaft 22 so that the diaphragm is caused to vibrate rapidly and alternately decrease and increase the size oitlie chamber above the diaphragm. The .cup member 28 is provided with external radiating fins 48 and with@. cover 50 in which is an inlet opening provided-with a filter or strainer 52. A curved enclosing member 54 is detachably held in place below the bracket 24 for protecting the crank pin. 46 and the parts associated therewith.

The bottom 29 of the cup member 28 is provided with a downwardly opening weighted valve 56 and with an upwardly opening valve 58, the latter being located in an upward extension 60 closed 'at its upper end by a screw plug 62. The extension 60 above the valve 58 is provided with a lateral opening 64 to which is connected a delivery pipe 66 formed in and leading out from a supporting member 68 mounted above the motor housing 10; The upper side of the support 68 has a diaphragm 70 secured thereto at its periphery, the bottom or the diaphragm at its center being in communication through an opening 72 with the pipe 66 so that the pressure carried by the pipe is imposed upon the bottom or the diaphragm. The support 68 carries an upwardly extending yoke member 74 through the upper portion of which an adjusting screw 76 is thread;- ed. A coiled spring 78 is interposed between the screw '16 anda cup member 80 resting upon the tached by means of a ball bearing device 44 to a et support and driving connections forthe dia-.

5 the housing 10 has a. head 14 and at the other diaphragm 70, a forked arm 82 is pivoted at one 45 end has a head 16, these heads being provided respectively with bearings 18 and 20 for a motor shaft 22. The head 16 as best shown in Fig.1 carries an integral ket support 24 which exend to the yoke member '74 and the forked arm carries trunnions 84 resting in notches on the upper end of the cup 80. Mounted on the other end of the arm 82 is a mercury switch 86 in 60 tends out from the ead at a position above the the circuit which supplies the motor. This switch 5 bearing 20 as shown in Fig: 3. The bracket 24 is hollow and at its upper end is provided with a peripheral flange 26 upon which a cup like member 28 having an upwardly convexed bottom 29 is 85 secured byscrews 30 passing intothreaded openswitch iscaused to swingupwardly thereby 'open- '56 as shown in Fig. 3 has a normally closed position, but when the pressure in the pipe .66 reaches a certain amount-determined by the setting of the screw 76, the end or the arm carrying the 2 ing the switch and stopping the motor. The mer 'cury switch and associated parts are protected I crank pin 46 attached thereto will reciprocate the connecting rod 38 and cause the diaphragm 34 toobe rapidly, flexed upwardly and downwardly in alteration. Upon the upward stroke, the fluid in 'the chamber above the diaphragm will be forced out through the outlet valve, the inlet valve 56 of course being closed by the pressure exerted thereon. Upon the downward stroke, a vacuum will be created in the chambr so that fluid will flow from the source of supply past the inlet valve into the chamber during which time the outlet valve is closed. Even should there be a'leak backwardly from this valve, the weighting of the inlet valve prevents sticking thereof without any liability of the motor becoming stalled. On account of the compactnss of the device, it can be readily placed in any convenient'location. The provision of a gearless device with a simple connecting rod construction extending directly down from a diaphragm carried by a bracket suport extending out integrally from one of the heads of the motor housing insures quiet and efficient operation. The provision of detachable enclosing members renders it easy to get at all of the enclosed parts for repair thereof. Although I have shown and described certain specific embodiments of my invention, I am fully aware that other embodiments thereof are possible. The invention, therefore, is not to be restricted except insofar as is necessitated by the prior art and by the spirit of the following claims.

I claim;

1. A pump comprising a motor formed with an integral support, a diaphragm carried by said support, a wall mounted above said diaphragm whereby a chamber is formed between said elements, a weighted inlet valve for said chamber mounted in said wall, an outlet valve for said chamber mounted in said wall, and connections between the shaftof said motor and said diaphragm for rapidly vibrating the latter, the provisiomof said weighted valve serving to prevent stalling of the motor.

2. ,A pump comprising a motor formed with an integral support, a diaphragm carried by said support, a wall mounted above said diaphragm whereby a chamber is formedbetween said elements. an outlet valve for said chamber mounted in said wall, an inlet valve for said chamber mounted in said wall, and driving connections for" said diaphragm extending down and connected to the shaft of the motor directly below said diaphragm.

3. A pump comprising a motor formed with an integral support, a diaphragm carried by said support, a cup-shaped member mounted above said diaphragm whereby a chamber is formed between said elements, an outlet valve for said chamber mounted in the bottom of said cup member, an inlet valve for said chamber mounted in the bottom of said cup member, a detachable cover for said cup member, an intake opening for fluid in said cover, a fllter for said opening, and

connections between the shaft of said motor and said diaphragm for rapidly vibrating the latter.

heads, a hollow bra'cket'support extending'out integrally from one of said heads, a diaphragm secured at its periphery to the upper portion of said bracket support, a chamber above said diaphragm, an inlet valve for said chamber, an outlet valve for said chamber, and connections between the motorshaft and said diaphragm for rapidly vibrating the latter.

5. A pump comprising a motor housing having heads, a hollow bracket support extendin out integrally from the upper portion of one 0 said heads, a diaphragm secured at its periphery to the upper portion of said bracket support, a chamber above said diaphragm, an inlet valve for said chamber, an outlet valve, for said chamber, connections between the motor shaft and said diaphragm for rapidly vibrating the latter,'and an enclosing member for said connections detachably held between the lower end of said support and said head. 6. 4 pump comprising a motor housing having heads, a hollow bracket support extending out integrally from one of said heads, a cup shaped member secured tothe upper end of said bracket support, a diaphragm clamped at its periphery between said cup member and bracket support whereby a chamber is formed between said elements, a weighted inlet valve for said chamber mounted in the bottom of said cup member, an outlet valve for said chamber mounted in the bottom of said cup member, a detachable' cover for said cup member containing an intake opening, and connections between the motor shaft and 

